Most homeowners adjust their thermostat several times a day without giving it much thought. Maybe you lower it before bed, raise it before leaving for work, or turn it down a few degrees when the house starts feeling warm in the afternoon.
Those small adjustments may seem insignificant, but they can have a bigger impact than you realize.
The temperature you choose affects more than just your comfort. It influences how long your air conditioner runs, how much energy it uses, and ultimately what you’ll see on your monthly utility bill.
So, what temperature should you actually set your thermostat to during the summer?
The answer depends on whether you’re home, asleep, or away. At Cool Masters Services, one of the most common summer questions we hear is, “What should I set my thermostat to?”
In this guide, we’ll explain the ideal temperatures for different situations, why they work, and what to do if your home still isn’t staying comfortable.
Quick Answer: What Temperature Should You Set Your Thermostat to in Summer?
For most homeowners, 78°F is the recommended thermostat setting when you’re home during the summer. Raising it to 82–85°F while you’re away and lowering it to 74–76°F while sleeping can help balance comfort, energy efficiency, and cooling costs. Using a programmable or smart thermostat makes these adjustments automatically, helping you stay comfortable while reducing unnecessary energy use.
Why 78°F Is the Recommended Summer Thermostat Setting
If you’ve ever searched for the “best thermostat setting,” you’ve probably seen 78°F recommended over and over again.
There’s a good reason for that.
It’s the temperature that many HVAC professionals and energy-efficiency organizations recommend because it strikes a balance between comfort and energy use. At 78°F, your air conditioner doesn’t have to work as hard as it would at lower temperatures, helping reduce electricity consumption without making most homes feel uncomfortably warm.
That doesn’t mean 78°F is perfect for every household.
Sunlight, humidity, insulation, ceiling height, and even where your thermostat is located can all affect how comfortable your home feels. Some families are perfectly comfortable at 78°F, while others may prefer 76°F or 77°F.
Rather than chasing one “perfect” number, think of 78°F as a starting point and adjust slightly based on your home’s needs.
The Best Thermostat Settings for Every Part of Your Day
Your thermostat doesn’t have to stay at one temperature all day. In fact, adjusting it based on your schedule is one of the easiest ways to improve comfort while reducing energy use.
When you’re home
Recommended setting: 78°F
This provides a comfortable indoor temperature for most homes while keeping your AC from running longer than necessary.
When you’re sleeping
Recommended setting: 74–76°F
Many people sleep better in a slightly cooler room. If you use ceiling fans, you may find you can stay comfortable without lowering the thermostat even further.
When you’re away
Recommended setting: 82–85°F
Raising the temperature while the house is empty reduces unnecessary cooling but still helps control indoor humidity and prevents your home from overheating.
When you’re on vacation
Recommended setting: Around 85°F
Turning your air conditioner off completely may allow humidity to build up inside your home. Keeping the thermostat around 85°F helps protect your home while saving money this summer.
Why Lowering the Thermostat Doesn’t Cool Your House Faster
One of the biggest HVAC myths is that setting the thermostat dramatically lower will cool your house more quickly.
It won’t.
Your air conditioner cools at the same rate whether the thermostat is set to 78°F or 68°F. Lowering the setting simply tells the system to keep running until it reaches that lower temperature.
If your home feels hot after you’ve been away all day, resist the urge to crank the thermostat down. Setting it to your desired temperature is the fastest and most efficient way to cool your home.
If it still takes hours to reach that temperature, the problem may not be the thermostat at all.
Should You Leave Your Thermostat at One Temperature?
Another common question is whether it’s better to leave the thermostat alone all day or adjust it as you come and go.
For most households, allowing the temperature to rise while you’re away saves more energy than cooling an empty home for hours.
The key is avoiding constant manual adjustments throughout the day.
A programmable or smart thermostat can automatically make those changes based on your schedule, helping improve efficiency without requiring you to remember every time you leave the house.
Are Smart Thermostats Worth It?
For many homeowners, yes.
A smart thermostat does more than let you control the temperature from your phone.
Many models can:
- Learn your daily schedule
- Automatically adjust temperatures
- Detect when no one is home
- Provide energy-use reports
- Send maintenance reminders
- Integrate with other smart home devices
Those features don’t just make life more convenient. They can also help reduce unnecessary cooling and improve your home’s overall efficiency.
When the Thermostat Isn’t the Problem
Setting your thermostat to the recommended temperature won’t solve every comfort issue. If your home still feels warm or humid, the thermostat may simply be revealing an underlying HVAC problem rather than causing it.
Common issues that can make your home feel uncomfortable include:
- High indoor humidity
- Dirty air filters that restrict airflow
- Leaky ductwork
- Air leaks around windows and doors
- Rooms with heavy afternoon sun exposure
- An aging or improperly sized air conditioner
You may also notice warning signs such as your AC running almost constantly, certain rooms staying warmer than others, rising energy bills, or your system struggling to reach the temperature you’ve selected.
In Georgia, humidity is one of the biggest factors affecting indoor comfort. Even if your thermostat reads 74°F, excess moisture in the air can make your home feel sticky and warmer than the actual temperature.
If you’ve tried adjusting your thermostat and your home still isn’t comfortable, it’s worth having your HVAC system inspected. Problems like restricted airflow, dirty coils, low refrigerant, or duct leaks can all prevent your air conditioner from cooling efficiently.
Frequently Asked Questions
Is 78°F really cool enough during the summer?
For many homeowners, yes. It’s widely recommended as a balance between comfort and energy efficiency, though personal preferences and your home’s conditions may justify slight adjustments.
Can ceiling fans help me use a higher thermostat setting?
Yes. Ceiling fans create a wind-chill effect that helps you feel cooler, allowing many homeowners to stay comfortable at a slightly higher temperature. Just remember to turn fans off when the room is empty, since they cool people—not the air.
Will a smart thermostat really lower my energy bills?
It can. Smart thermostats automatically adjust temperatures based on your schedule, helping prevent unnecessary cooling and improving overall efficiency.
Why does my house still feel humid even when the AC is running?
High indoor humidity can make your home feel warmer than the thermostat reading. Dirty filters, airflow restrictions, oversized equipment, or other HVAC issues may prevent your system from removing moisture effectively.
How often should a thermostat be replaced?
Most thermostats last around 10 years. Many homeowners choose to upgrade sooner to take advantage of programmable schedules, smart features, and improved energy efficiency.
Why Homeowners Across Metro Atlanta Choose Cool Masters Services
The right thermostat setting can improve comfort and reduce cooling costs, but it can’t solve every HVAC problem.
If your air conditioner struggles to keep up, your home feels humid, or your energy bills continue to climb, our team can help identify the underlying cause.
Since 2005, Cool Masters Services has helped homeowners throughout Metro Atlanta and Greater Gwinnett improve comfort with honest recommendations, expert repairs, preventative maintenance, and energy-efficient HVAC solutions.
Whether you need an AC tune-up, repairs, a smart thermostat installation, or guidance on improving your home’s cooling performance, we’re here to help.
Stay Comfortable While Keeping Cooling Costs Under Control
Finding the right thermostat setting is one of the easiest ways to improve comfort and reduce energy use, but it’s only part of the equation.
If your home still feels uncomfortable despite following these recommendations, it may be time to have your HVAC system evaluated.
Schedule service with Cool Masters Services today and let our experienced technicians help you keep your home cool, comfortable, and energy efficient all summer long.